Abstract: The drum type washing machine of the present invention is equipped with a drum that is rotated around a horizontal axis of rotation where the drum is formed by an outer wall with a form obtained by mutually joining the large-diameter parts of two truncated cones with substantially the same form. A plurality of beaters are installed on the inner surface of the peripheral wall of the drum with a predetermined spacing in the circumferential direction of the drum, arranged centripetally along the peripheral wall extending over the entire length of the drum in the direction of the rotary shaft.